The BMW R90 series, including the R90/6 and the sportier R90S, represents a significant era in high-performance motorcycle touring. Produced between 1973 and 1976, these machines are renowned for their robust 900cc air-cooled boxer twin engines, shaft drive, and exceptional build quality. The R90/6 offered a comfortable, capable platform for long-distance travel, while the R90S provided enhanced performance and distinctive styling. Both models are celebrated for their engineering, reliability, and the enduring appeal of BMW's classic motorcycle design, making them highly sought after by enthusiasts.

This comprehensive repair service manual provides in-depth guidance for the maintenance, troubleshooting, and repair of BMW R90 series motorcycles. It covers all essential systems, including the engine, transmission, drivetrain, fuel, ignition, electrical, brakes, and suspension. The manual offers detailed procedures for routine maintenance, common repairs, and complete overhauls, along with critical technical specifications and wiring diagrams. Its purpose is to empower owners, mechanics, and technicians with the knowledge needed to preserve the performance and longevity of these iconic machines.